She claimed that in 2005 she went to interview the mogul and his wife at their Mar-a-Lago estate in Palm Beach, Florida, where he “was pushing me against the wall, and forcing his tongue down my throat”.

The Trump campaign said there was no “merit or veracity” to the story.

The allegations cap a dismal week for Mr Trump which saw him out-pointed by Hillary Clinton in the second TV presidential debate and witnessed dozens of leading Republicans turn their back on his campaign.

Republican nominee Donald Trump and Democrat nominee Hillary Clinton arrive on the stage before they participate in the 2nd debate (Image: Getty)

A Reuters/Ipsos poll this week showed one in five Republicans thought Trump’s comments about groping women disqualified him from the presidency. It also placed him eight points behind Mrs Clinton in the race for the White House.

Mrs Clinton’s communication’s director, Jennifer Palmieri, said the latest run of allegations “sadly fits everything we know about the way Donald Trump has treated women”.

On Saturday recording emerged of Mr Trump boasting that his fame allowed him to force himself on women.

Ivanka and Donald Trump (Image: Getty)

“And when you’re a star, they let you do it,” Mr Trump said. He added: “Grab them by the p****. You can do anything.”